My guess is the shaft has backed out of the coupling for the most part and probably just machined off maybe an eighth of an inch of the key. You may not have to remove the coupling half. Just try shifting the shaft aft a little more being cautious not to let it get away from you like Shawn cautioned. If you are lucky, all you need to do is install a new Key and then slide the shaft forward and then tighten down on the retaining bolt.
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